The 20-year-old has attracted plenty of attention for his performances for the Highlanders this campaign but Jack Ross’ men have won the race.
The player will make the move to Easter Road if he completes his medical in the “next day or so”.
Capable of playing across the attack, Mackay has been an increasingly impressive presence for Inverness CT this season, netting four goals in April. He has nine in 30 appearances in all competitions this campaign.
“We are delighted to have agreed a fee with Inverness for Daniel,” Hibs sporting director Graeme Mathie said.
“He fits the profile of the type of players we want to continue to bring to the club.
“In all the conversations we have had with Daniel, his family and his representatives, it was clear that they all see Hibernian as the right place to continue to develop his career.
“We want to be known as the best club in Scotland for developing talent and it’s great credit to Jack and the staff that young players can see a number of examples of players improving under their guidance.
“We have no doubt Daniel can be another who develops throughout his time here.
“I’d also like to thank Scot Gardiner of Inverness and Allan Preston of IMC Stellar who have both been excellent to deal with in negotiations.”
‘A number of Scottish and English clubs’
The Highlanders chief Gardiner confirmed interest from a “number” of clubs, noting the financial pressure and offer on the table from Hibs as key to seeing the transfer progress.
“We have had a number of clubs following Daniel’s progress over the last couple of years,” Gardiner said. “We actually turned down an offer for him last season from one top club as we believed both Daniel and the club would be better served by him playing and developing here at ICT. This was proved to be correct on both fronts.
“That said, his recent terrific form has brought a number of Scottish and English clubs back to the table. Ultimately, the risk of losing him in just over a year’s time and the perseverance which Hibs showed in their pursuit of Dan, allied to the significant immediate and future package we agreed, meant that we could not reasonably turn their offer down, however much we wanted to keep Daniel.
“As disappointed as we are to lose Daniel, the continuing financial pressures caused by the pandemic meant that we took the only pragmatic decision we could, while negotiating the best possible package for the club. Daniel goes with our best wishes for his career going forward. He has been at the club since the age of 8, he has been a Caley Jag for 12 years and he was a season ticket holder for most of that time and he will always be welcome back at the Caledonian Stadium.”
“Our thanks goes to the officials at Hibernian and indeed those at the other clubs who were involved in the extended discussions we have been having over the last couple of weeks, all of which were handled with respect, professionalism and complete discretion throughout.”